Oblicz! (zapisz obliczenia)   1. v=90km/h     t=20s             s=?                  2. v=15m/s     s=20km         t=?   3. t=2omin     s=800km        v=?        Z gory dziękuje!!! ;)))  

1. t=20s= 1/3h     v = 90 km/h     v = s/t     s = t x v [h x km/h = km]     s = 90 x 1/3 = 30km 2. v = 15m/s     s = 20km = 2000m     v = s/t     t = s/v [m / m/s =s]     t = 2000/15 = 133.333s 3. t = 20 min     s = 800km     v = s/t [km/min]     v = 800/20 = 40 km/min

1. s = V * t v = 90km/h t = 20 s musimy to zamienic w taki sposob, aby byly te same jednostki v = 90km/h t = 20s = 1/3 h s = 90km/h * 1/3h = 30km   2. t = s : V v = 15m/s s = 20km jednostki!!! v=15m/s * 3,6 = 54 km/h  s = 20 km t = 20 km : 54 km/h = 0,37 h   3. t = 20 min s = 800km v = s/t v = 800km : 20 min = 40 km/min